Index: uspace/drv/bus/usb/xhci/hc.c
===================================================================
--- uspace/drv/bus/usb/xhci/hc.c	(revision 110d7951a92abed55ef5aab651f32aa7733ab100)
+++ uspace/drv/bus/usb/xhci/hc.c	(revision aee352ca428c9cc2888b4f9f80203953aec66072)
@@ -211,4 +211,7 @@
 		goto err_event_ring;
 
+	if ((err = xhci_init_commands(hc)))
+		goto err_event_ring;
+
 	return EOK;
 
@@ -352,5 +355,5 @@
 {
 	xhci_dump_state(hc);
-	xhci_send_no_op_command(hc);
+	xhci_send_no_op_command(hc, NULL);
 	async_usleep(1000);
 	xhci_dump_state(hc);
@@ -405,4 +408,13 @@
 void hc_interrupt(xhci_hc_t *hc, uint32_t status)
 {
+	/**
+	 * TODO: This is a temporary workaround, when an event interrupt
+	 *       happens, status has the value of 3, which is equal to
+	 *       XHCI_REG_SHIFT(XHCI_OP_EINT), intstead to the correct
+	 *       XHCI_REG_MASK(XHCI_OP_EINT), which has the value of 8 (1 << 3).
+	 *       This is how e.g. FreeBSD does it.
+	 */
+	status = hc->op_regs->usbsts;
+
 	if (status & XHCI_REG_MASK(XHCI_OP_HSE)) {
 		usb_log_error("Host controller error occured. Bad things gonna happen...");
@@ -414,7 +426,18 @@
 		xhci_interrupter_regs_t *intr0 = &hc->rt_regs->ir[0];
 
-		if (XHCI_REG_RD(intr0, XHCI_INTR_IP)) {
+		/**
+		 * EINT has to be cleared before IP, but we also need to
+		 * handle the event before clearing EINT.
+		 */
+		uint32_t ip = XHCI_REG_RD(intr0, XHCI_INTR_IP);
+
+		if (ip | 1) { // TODO: IP is being cleared right after it is set by the xHC.
+			hc_run_event_ring(hc, &hc->event_ring, intr0);
+		}
+
+		XHCI_REG_SET(hc->op_regs, XHCI_OP_EINT, 1);
+
+		if (ip) {
 			XHCI_REG_SET(intr0, XHCI_INTR_IP, 1);
-			hc_run_event_ring(hc, &hc->event_ring, intr0);
 		}
 	}